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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2834359e67a4f58e77fa192fc70fcc03b73c8c23d812d1ae8494d620cb4c5ec9' 
  AND token = 'Ms5QwclIcrC1I6OH3WVY9Y161nwRnCdf+U5KXAqe0s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}